Add config option to disable EWS SSL cert verification
Don't attempt to notify if notifier not enabled
Add config option for timezone
Add toggle option to mark email as read on notify

If the option is disabled, then emails will not be marked as read on
the server when a notification is made. Emails that have been
notified but not marked as read are not notified again in the same
session.
Merge pull request #1 from ultrafez/master

Add various options: mark as read, timezone, SSL certificate verification